package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;


public class BeforeLoginInterceptor implements HandlerInterceptor {

    private final StringRedisTemplate stringRedisTemplate;


    public BeforeLoginInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取session
//        HttpSession session = request.getSession();
        // 2.获取session中的用户,包括手机号和昵称
//        Object user = session.getAttribute("user");
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        //2.获取redis中的用户信息
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(LOGIN_USER_KEY+token);
        // 3.判断用户是否存在
        if (userMap.isEmpty()) {
            // 4.不存在，返回未登录结果
            return true;
        }
        //5.存在，将用户信息转换为UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //6.保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        //7.刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL, TimeUnit.MINUTES);




        return true;
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }

}
